Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 663 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.Which of these is caused by gravity? (a) a rolling ball slows (b) lifting a school bag (c) a magnet picks up pins (d) an apple falls down
2. 2.True or false: a fixed pulley halves the effort. (a) False (b) True
3. 3.True or false: powder on a carrom board gives less friction. (a) False (b) True
4. 4.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
5. 5.🔍 Which is the odd one out? (a) a nut and bolt (b) a jar lid (c) a door stopper (d) a bottle cap
6. 6.True or false: pressing a doorbell is a push. (a) False (b) True
7. 7.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
8. 8.True or false: chalk on a gym bar gives more friction. (a) True (b) False
9. 9.🏋️ A 3 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the load (d) nothing
11. 11.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
12. 12.🔍 Which is the odd one out? (a) a screw jack (b) a jar lid (c) a crane hook block (d) a wood screw
13. 13.🏋️ A force of 30 N pushes a cart 8 m along the floor. How much work is done, in joules?
14. 14.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
16. 16.🏋️ A machine lifts a load of 40 N when you push with 10 N. What is its mechanical advantage (MA)?
17. 17.Which of these is caused by muscular force? (a) squeezing a lemon (b) a magnet picks up pins (c) a compass needle turns (d) an apple falls down
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.Which of these is a lever? (a) a wheelchair ramp (b) a seesaw (c) the tip of a nail (d) a wood screw
20. 20.🏋️ A machine lifts a load of 240 N when you push with 120 N. What is its mechanical advantage (MA)?
21. 21.💪 Two equal forces push on a box from opposite sides. They are … (a) balanced (b) unbalanced (c) doubled (d) gravity
22. 22.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
23. 23.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
24. 24.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
25. 25.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
26. 26.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
27. 27.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
28. 28.🔍 Which is the odd one out? (a) a screw jack (b) a claw hammer on a nail (c) a nut and bolt (d) a bottle cap
29. 29.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
30. 30.🔍 Which is the odd one out? (a) a window blind cord (b) a bottle cap (c) a crane hook block (d) a well-bucket rope wheel
31. 31.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 6 (c) 3 (d) 10
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
33. 33.True or false: a crane hook block is a pulley. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) oil on a squeaky hinge (d) skating on ice
35. 35.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
36. 36.⚖️ A lever bar balances. The load is 540 N at 50 cm from the fulcrum. The effort is 450 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
38. 38.True or false: pushing a trolley is a pull. (a) True (b) False
39. 39.⚖️ A lever bar balances. The load is 210 N at ? cm from the fulcrum. The effort is 210 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
40. 40.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids